ASE Brakes T4 Prac ce Test #1| Ques ons and answers |
Updated RATED A+ | 2026
Which of the following could cause the brakes on a truck to wear too fast?
A. Glazed Drums
B. Wrong linings installed
C. Low air pressure in the service tanks
D. Governor cut-out pressure too high
Answer A is incorrect. Glazed drum linings are hard and do not wear. They also do not stop the
truck.
Answer B is correct. The wrong lining for the applica$on may be the problem.
Answer C is incorrect. Low air pressure in the tanks would not cause brake wear. It may cause a
low amount of reserve air in case of mul$ple brake applica$ons.
Answer D is incorrect. High governor cut=out pressure may cause the safety valve to open, but
would not cause the brakes to wear too fast.
Which of the following could case one brake on a truck to wear faster than the others?
A. Mismatched service brake chambers
B. Mismatched parking brake chambers
C. Low air pressure in the service tanks
D. Governor cut-out pressure too low
Answer A is correct. Mismatched brake service chambers would apply unequal brake applica$on
pressure from side to side, which would cause one brake to wear faster.
Answer B is incorrect. Mismatched parking brake chambers would not cause brake wear. It
would possibly allow the brake to roll when parked, because one side could have insufficient
parking brake applica$on.
Answer C is incorrect. Low air pressure in the tanks would not cause brake wear. It may cause a
low amount of reserve air in case of mul$ple brake applica$ons
Answer D is incorrect. Low governor cut-out pressure may cause an inadequate amount of air in
reserve but would not cause the brake to wear too fast.
There is an audible air leak from under the dash when the foot valve is applied. Technician A
says the double-check valve may be faulty. Technician B says the single-check valve may be
faulty. Who is correct?
,A. A only
B. B only
C. Both A and B
D. Neither A nor B
Answer A is correct. A leaking double check valve could allow air to flow to the foot valve and
out the open exhaust
Answer B is incorrect. Single check valves are used to protect the tanks. They do not cause an air
leak when the brakes are applied.
Answer C is incorrect. Technician B is incorrect.
Answer D is incorrect. Technician A is correct.
On a straight truck equipped with air brakes, the secondary tank pressure gauge falls to zero
when she wet air tank is drained. Technician A says the one-way check valve may be faulty.
Technician B says the foor valve may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
Answer A is correct. The one way check valve should protect the secondary tank. The check
valve is leaking.
Answer B is incorrect. The foot valve does not separate the wet and secondary tanks.
Answer C is incorrect. Technician B is incorrect.
Answer D is incorrect. Technician A is correct.
Which of the following could set an an$lock braking system (ABS) wheel speed sensor code:
A. Faulty modulator hold solenoid
B. Faulty modulator release solenoid
C. Incorrect wheel bearing adjustment
D. Incorrect brake adjustment
Answer A is incorrect. A faulty solenoid would not cause a wheel speed sensor code. It could
cause a modulator valve code.
Answer B is incorrect. A faulty solenoid would not cause a wheel speed sensor code. It could
cause a modulator valve code
Answer C is correct. A loose wheel bearing adjustment can cause a faulty wheel speed sensor
and a wheel speed sensor code.
Answer D is incorrect. An incorrect brake adjustment may cause a dragging brake but would not
cause a wheel speed sensor code
, The air drier purged too o6en. Technician A says the air drier delivery check valve may be
leaking. Technician B says a leaking wet tank could be the cause. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
Answer A is incorrect. Technician B is also correct.
Answer B is incorrect. Technician A is also correct.
Answer C is correct. A leaking air drier check valve will allow the wet tank to drain back through
the air drier. This will cause air pressure to drop to governor cut-in rapidly. The air compressor
will again build tank pressure and unload, and the sequence will start over. A leaking wet tank
will cause the air pressure to fall rapidly and the compressor to build air again and then cut out.
This too will cause the air drier to purge o6en.
Answer D is incorrect. Both technicians are correct.
The safety valve releases on the air tank. Which of the following is the most likely cause?
A. Plugged line from the supply tank to the governor
B. Faulty tractor protec$on valve
C. Stuck spi8er on the air drier
D. Faulty secondary tank
Answer A is correct. If the line from the supply tank to the governor were plugged the governor
would not unload the compressor.
Answer B is incorrect. The tractor protec$on valve could not cause excessive pressure.
Answer C is incorrect. A stuck spi8er would prevent the air drier from purging.
Answer D is incorrect. A faulty secondary tank could leak, but that would not cause excessive air
pressure.
A truck with hydraulic disc/drum brakes has a high firm pedal with poor stopping. Which of the
following could be the cause?
A. The brakes are adjusted too loose.
B. The brake linings are glazed.
C. The brake pedal pushrod is too long.
D. The driveline parking brake is misadjusted.
Answer A is incorrect. If drum brakes are adjusted too loose the pedal will be low because the
pedal will need to travel farther to take up the clearance.
Answer B is correct. Glazed brake linings will not create the fric$on needed to stop the truck but
will allow the pedal to feel high and firm.
Updated RATED A+ | 2026
Which of the following could cause the brakes on a truck to wear too fast?
A. Glazed Drums
B. Wrong linings installed
C. Low air pressure in the service tanks
D. Governor cut-out pressure too high
Answer A is incorrect. Glazed drum linings are hard and do not wear. They also do not stop the
truck.
Answer B is correct. The wrong lining for the applica$on may be the problem.
Answer C is incorrect. Low air pressure in the tanks would not cause brake wear. It may cause a
low amount of reserve air in case of mul$ple brake applica$ons.
Answer D is incorrect. High governor cut=out pressure may cause the safety valve to open, but
would not cause the brakes to wear too fast.
Which of the following could case one brake on a truck to wear faster than the others?
A. Mismatched service brake chambers
B. Mismatched parking brake chambers
C. Low air pressure in the service tanks
D. Governor cut-out pressure too low
Answer A is correct. Mismatched brake service chambers would apply unequal brake applica$on
pressure from side to side, which would cause one brake to wear faster.
Answer B is incorrect. Mismatched parking brake chambers would not cause brake wear. It
would possibly allow the brake to roll when parked, because one side could have insufficient
parking brake applica$on.
Answer C is incorrect. Low air pressure in the tanks would not cause brake wear. It may cause a
low amount of reserve air in case of mul$ple brake applica$ons
Answer D is incorrect. Low governor cut-out pressure may cause an inadequate amount of air in
reserve but would not cause the brake to wear too fast.
There is an audible air leak from under the dash when the foot valve is applied. Technician A
says the double-check valve may be faulty. Technician B says the single-check valve may be
faulty. Who is correct?
,A. A only
B. B only
C. Both A and B
D. Neither A nor B
Answer A is correct. A leaking double check valve could allow air to flow to the foot valve and
out the open exhaust
Answer B is incorrect. Single check valves are used to protect the tanks. They do not cause an air
leak when the brakes are applied.
Answer C is incorrect. Technician B is incorrect.
Answer D is incorrect. Technician A is correct.
On a straight truck equipped with air brakes, the secondary tank pressure gauge falls to zero
when she wet air tank is drained. Technician A says the one-way check valve may be faulty.
Technician B says the foor valve may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
Answer A is correct. The one way check valve should protect the secondary tank. The check
valve is leaking.
Answer B is incorrect. The foot valve does not separate the wet and secondary tanks.
Answer C is incorrect. Technician B is incorrect.
Answer D is incorrect. Technician A is correct.
Which of the following could set an an$lock braking system (ABS) wheel speed sensor code:
A. Faulty modulator hold solenoid
B. Faulty modulator release solenoid
C. Incorrect wheel bearing adjustment
D. Incorrect brake adjustment
Answer A is incorrect. A faulty solenoid would not cause a wheel speed sensor code. It could
cause a modulator valve code.
Answer B is incorrect. A faulty solenoid would not cause a wheel speed sensor code. It could
cause a modulator valve code
Answer C is correct. A loose wheel bearing adjustment can cause a faulty wheel speed sensor
and a wheel speed sensor code.
Answer D is incorrect. An incorrect brake adjustment may cause a dragging brake but would not
cause a wheel speed sensor code
, The air drier purged too o6en. Technician A says the air drier delivery check valve may be
leaking. Technician B says a leaking wet tank could be the cause. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
Answer A is incorrect. Technician B is also correct.
Answer B is incorrect. Technician A is also correct.
Answer C is correct. A leaking air drier check valve will allow the wet tank to drain back through
the air drier. This will cause air pressure to drop to governor cut-in rapidly. The air compressor
will again build tank pressure and unload, and the sequence will start over. A leaking wet tank
will cause the air pressure to fall rapidly and the compressor to build air again and then cut out.
This too will cause the air drier to purge o6en.
Answer D is incorrect. Both technicians are correct.
The safety valve releases on the air tank. Which of the following is the most likely cause?
A. Plugged line from the supply tank to the governor
B. Faulty tractor protec$on valve
C. Stuck spi8er on the air drier
D. Faulty secondary tank
Answer A is correct. If the line from the supply tank to the governor were plugged the governor
would not unload the compressor.
Answer B is incorrect. The tractor protec$on valve could not cause excessive pressure.
Answer C is incorrect. A stuck spi8er would prevent the air drier from purging.
Answer D is incorrect. A faulty secondary tank could leak, but that would not cause excessive air
pressure.
A truck with hydraulic disc/drum brakes has a high firm pedal with poor stopping. Which of the
following could be the cause?
A. The brakes are adjusted too loose.
B. The brake linings are glazed.
C. The brake pedal pushrod is too long.
D. The driveline parking brake is misadjusted.
Answer A is incorrect. If drum brakes are adjusted too loose the pedal will be low because the
pedal will need to travel farther to take up the clearance.
Answer B is correct. Glazed brake linings will not create the fric$on needed to stop the truck but
will allow the pedal to feel high and firm.
